Signal transmitter



FIG. 1 is a front, left perspective view of the signal transmitter in accordance with a first embodiment of the design;

FIG. 2 is a front side view of the signal transmitter of FIG. 1, the rear side view being a mirror image thereof;

FIG. 3 is a left side view of the signal transmitter of FIG. 1, the right side view being a mirror image thereof;

FIG. 4 is a top plan view of the signal transmitter of FIG. 1;

FIG. 5 is a bottom plan view of the signal transmitter of FIG. 1;

FIG. 6 is a front, left perspective view of the signal transmitter in accordance with a second embodiment of the design;

FIG. 7 is a front side view of the signal transmitter of FIG. 6, the rear side view being a mirror image thereof;

FIG. 8 is a left side view of the signal transmitter of FIG. 6, the right side view being a mirror image thereof;

FIG. 9 is a top plan view of the signal transmitter of FIG. 6; and,

FIG. 10 is a bottom plan view of the signal transmitter of FIG. 6.

The broken line representations in the Figures are for the purpose of illustration only, and form no part of the design. 

CLAIM The ornamental design for a signal transmitter, as shown and described. 